Electron heat transport through the plasma-electrode boundary in weakly ionized plasma

The average electron thermal energies in the emission flux from the electrode into the plasma, ? ₁, and from the plasma toward the electrode, ? ₂, are determined for the cases of large and small values of the coefficient of kinetic reflection. It is shown that these energies vary within the ranges 0.5k _B T _c < ? ₁ < 2k _B T _c and 0.5k _B T _e < ? ₂ < 2k _B T _e , where T _c and T _e are the temperatures of the cathode and plasma electrons, respectively. The obtained values can be used to formulate the boundary conditions for the hydrodynamic equations at the electrode or a dielectric wall.